[PATCH] xfs: relocate sparse inode mount warning

[Brian Foster <bfoster@redhat.com>]

The sparse inodes feature is currently considered experimental. We warn
at mount time from xfs_mount_validate_sb(). This function is part of the
superblock verifier codepath, however, which means it could be invoked
repeatedly on superblock reads or writes. This is currently only
noticeable from userspace, where mkfs produces multiple warnings at
format time.

As mkfs warnings were not the intent of this change, relocate the mount
time warning to xfs_fs_fill_super(), which is only invoked once and only
in kernel space.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_sb.c | 3 ---
 fs/xfs/xfs_super.c     | 4 ++++
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 21009db..4742514 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -186,9 +186,6 @@ xfs_mount_validate_sb(
 	if (xfs_sb_version_hassparseinodes(sbp)) {
 		uint32_t	align;
 
-		xfs_alert(mp,
-	"EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
-
 		align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
 				>> sbp->sb_blocklog;
 		if (sbp->sb_inoalignmt != align) {
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 1fb16562..f98ce83 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1528,6 +1528,10 @@ xfs_fs_fill_super(
 		}
 	}
 
+	if (xfs_sb_version_hassparseinodes(&mp->m_sb))
+		xfs_alert(mp,
+	"EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
+
 	error = xfs_mountfs(mp);
 	if (error)
 		goto out_filestream_unmount;
-- 
2.1.0

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